If you like puzzles, you can always give it a try...
The tetris game is well-know and if you like moving the cubes, that is an option without a doubt. It is just that this Xbox version doesn't offer any really interesting feature that could made it a classic or a must-have item.
It is fun to the planets "evolving", but besides that, Tetris Worlds stays in that common place that makes you wonder why you got it anyway when there are free online versions of it that are more interesting.
Sicnerely, I never really even bothered going online.
If you have nothing better to do, rent it, but don't expect much.